//nolint:testpackage // white-box tests reach unexported state (approved 2026-07-07)
package game

import (
	"strings"
	"testing"
)

// TestGreeting pins both wordings of main.c's pre-initscr printf byte for
// byte. The wizard one carries dnum, which main.c has just assigned to
// seed, so it is the seed the player sees. Neither ends in a newline: C
// printed, flushed, and handed the display to curses.
func TestGreeting(t *testing.T) {
	t.Parallel()

	// The account name main.c copies into whoami when ROGUEOPTS does not
	// name the player itself.
	const account = "conan"

	cases := []struct {
		name   string
		params Params
		want   string
	}{
		{
			name:   "normal",
			params: Params{Name: account, Seed: 4242},
			want:   "Hello conan, just a moment while I dig the dungeon...",
		},
		{
			name:   "wizard names the dungeon",
			params: Params{Name: account, Seed: 4242, Wizard: true},
			want:   "Hello conan, welcome to dungeon #4242",
		},
		{
			// parse_opts runs before the printf in main.c, and whoami
			// falls back to the account name only when ROGUEOPTS left it
			// empty, so the option is what the player is greeted by.
			name: "ROGUEOPTS name wins over the account name",
			params: Params{
				Name: account, Seed: 7, RogueOpts: "name=Rodney",
			},
			want: "Hello Rodney, just a moment while I dig the dungeon...",
		},
		{
			name: "ROGUEOPTS without a name keeps the account name",
			params: Params{
				Name: account, Seed: 7, RogueOpts: "terse,fruit=mango",
			},
			want: "Hello conan, just a moment while I dig the dungeon...",
		},
		{
			// ParseOpts reaches every option, not just name=, and the
			// inventory style is matched against a table (options.c
			// parse_opts, inv_t_name[]) that lives in the game data. A
			// greeting parsed on a game without those tables faulted on
			// this ROGUEOPTS before it could print anything at all.
			name: "ROGUEOPTS inventory style parses without a fault",
			params: Params{
				Name: account, Seed: 7, RogueOpts: "inven=slow,name=Rodney",
			},
			want: "Hello Rodney, just a moment while I dig the dungeon...",
		},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()

			got := Greeting(tc.params)
			if got != tc.want {
				t.Errorf("Greeting() = %q, want %q", got, tc.want)
			}

			if strings.HasSuffix(got, "\n") {
				t.Error("greeting ends in a newline; C's printf did not")
			}
		})
	}
}